duete; see due, ty 2 ]. syn: duty, obligation refer to something a person feels bound to do. A duty often applies to what a person performs in fulfillment of the permanent dictates of conscience, piety, right, or law: one's duty to tell the truth; a parent's duty to raise children properly.
Mutations in the RB1 gene are responsible for most cases of retinoblastoma. RB1 is a tumor suppressor gene, which means that it normally regulates cell growth and keeps cells from dividing too rapidly or in an uncontrolled way.
retinoblastoma is a cancer of the eye that occurs only in children it is a cancer of the very young child two thirds of retinoblastoma patients are diagnosed before they are 2 years old and more than 90 percent are diagnosed before the age of 5retinoblastoma can take two formsapproximately 75 percent of children with retinoblastoma have one tumor in one eyet is a cancer of the very young child two thirds of retinoblastoma patients are diagnosed before they are 2 years old and more than 90 percent are diagnosed before the age of 5 retinoblastoma can take two forms approximately 75 percent of children with retinoblastoma have one tumor in one eye